The Speed of Light in Air and in Water (1959)

This film demonstrates the measurement of the speed of light in both air and water using experimental setups. The first experiment involves measuring the time it takes for light to travel a known distance in air, utilizing a parabolic mirror and an oscilloscope for precision. The second experiment compares the speed of light in air and water by analyzing the time difference between light traveling through both mediums. The results show that light travels slower in water, confirming the index of refraction for light transitioning from air to water is approximately 4/3.

Keywords
speed of light, air, water, measurement, experiment, parabolic mirror, oscilloscope, index of refraction, light travel, physics

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